WISE OWL EXERCISES
SQL EXERCISES
SQL EXERCISES
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- Setting criteria using WHERE (5)
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- Basic joins (8)
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- Scalar functions (6)
- Transactions (5)
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- Table-valued functions (6)
- Derived tables and CTEs (13)
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SQL | Scalar functions exercise | Create various functions to show information about episodes
This exercise is provided to allow potential course delegates to choose the correct Wise Owl Microsoft training course, and may not be reproduced in whole or in part in any format without the prior written consent of Wise Owl.
The answer to the exercise will be included and explained if you attend one of more of the courses listed below!
| Software ==> | SQL (198 exercises) |
| Version ==> | Any version of SQL Server |
| Topic ==> | Scalar functions (6 exercises) |
| Level ==> | Harder than average |
| Courses ==> | Fast-track SQL / Advanced SQL |
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First (if you haven't already done so) run the script shown above to generate the Doctor Who training database.
See how many of the following functions you can create in the time left to you!
-- show all these functions working
SELECT
EpisodeId,
Title,
-- function to count number of companions for a given episode
dbo.fnNumberCompanions(EpisodeId) AS Companions,
-- function to count the number of enemies for an episode
dbo.fnNumberEnemies(EpisodeId) AS Enemies,
-- function to count the number of words (hint: use a combination
-- of LTRIM and RTRIM to remove leading and trailing spaces, then
-- REPLACE to change all spaces to empty strings and compare the
-- LEN of the string before and after this change!)
dbo.fnWords(Title) AS Words
FROM
tblEpisode
ORDER BY
Words DESC
Here's what you should see when you run the query, if you manage to create all of the functions listed:
Four episodes have 7 words each.
When (if?) you finish, optionally save your query as Too many functions.sql, then close it down.